Telephone for automobiles.



1. F. OBHIEN.

TELEPHONE FOR AUTOMOBILES.

APPHCATION FILED 001.25, 1913.

1, 182,926. I Pntntod May 16, 1916.

JOSEPH F. OIBRIEN, OF NEW YORK, N. Y.

TELEPHONE FOR AUTOMOBILES.

Specification of Letters Patent.

Patented May 16, 1916.

Application filed October 25, 1913. Serial No. 797,240.

To all whom it may concern Be it known that I, JOSEPH F. OBRLEN, a citizen of the United States, and resident of New York, in the county and State of' v New York, have invented certain new and useful Improvements in Telephones for Automobiles, of which the following is a specification.

This inventlon relates to a telephone set for use on a limousine or other vehicles.

The principal object of the invention is to provide a simple intercommunicating system' whereby the passenger and operator of the vehicle may communicate with one an- I other.

Heretofore the wind, street noises, and other. causes have prevented the proper transmission of the communication from the passenger to the operator, and one of the objects of the invention is to provide an instrum'ent accessible to the operator which will transmit in a loud and clear tonethe orders or other information given by the passenger. v The:.device comprises broadly speaking a portable telephone set in the passenger compartment and a permanently mounted telephone set in the operatore compartment connected together and to suitable current 3 supply source by suitable wiring. The instrumen'ts in the operators compartment are mounted within a, casing which has a single trumpet serving'as a mouth piece and ear piece. 35. The objects and novel features of the invention will be apparent from the following description, taken in connection with the drawing, in wh1ch+ Fi e 1 is a side elevation of an automob' e body partly in sectionshowing the same equipped with a telephone 'set. con:

structed according to the present invention;

Fig. 2 is a diagrammatic view of the connections, together with enlarged sectional views of the instruments in the compartments;

and Fig.3 is a simplified diagra f the circuits connecting the instruments Referring to'Fig. .1 of the drawin 10 designates an automobile vehicle body 0 any or- 80 dinary or preferred type which has an operators compartment 11 at the front'which is open at the sides and closed at the front and rear anda completely inclosed passenger compartment 12 .at the rear, the compartments being separated by the partition-13,

.In the operators compartment, there is a about the automobile.

erators compartment. The receiver 14: and

telephone set 0 which is connected to the telephone set P in the passenger compartment by means of suitable wiring, the batteries B and terminal board T being mounted beneath the seat S in the operators compartment or at any other suitable place The telephone set 0 in the operators compartment 11 comprises a double pole electromagnetic receiver 14: of any approved type, a carbon; diaphragm transmitter'15 of any suitable construction and an impedance coil 16 connected in series with the transmitter 15 by the wire 17 The receiver 14, transmitterl5, and impedance coil 16 are inclosed. within'a rectangular sheet metal casing 18 which has perforations 19 at one end thereof. Opposite the mouth piece of the receiver 14 there is an opening 20 in the easing 18 and a trumpet 21 is attached at and surrounds the said opening and forms a mouth piece and ear piece for the set inclosed within the casing. From the foregoing it will be seen that the trumpet 21 serves both as a mouth piece and as an ear piece and the loud speaking receiver 14 being directly in line with the trum et will have the vibrations thereof amplifie by the trumpet 21. The receiver 14 and impedance coil '16 are attached to a, cover-22 which closes the box 18 and has ears 23 at each end so that it may be attached to-the partition or any other suitable-place in the opimpedance coil 16, being attached to the cover, may be liftedout'therewith when the cover is removed from the casing 18.-

- The receiver 1 L rests against the rear wall of the casing 18 and is disposed a slight distance from the front wall so that when the operator speaks into the trumpet 21 the' sound vibrations will reach the transmitter 15,the sheet metal box 18 acting as an amplifier ofv the sound waves. However, the perforations '19 are necessary in order to obtain the proper-tone in the transmitter and to prevent roaring noises in the pas-- sengers receiver; due to resonance. The im-' pedance coil 16 'in series with'the transmitter15 eliminates certain vibrations in the passengers receiver and prevents whistling and such foreign noisesin the instrument.

The passengers portable telephone set P-' comprises a tubular metal stem 24providedi10 with an eye 2 1 at its upper end. The stem so I spring 29. The circuit closer spring 29 cooperates with the spring 30 so that the holder of the set can readily open and close the circuit and send a signal to the chauffeur or operator when he desires to communicate with the latter. The spring 29 is grounded on the metal stem 24 and one side of each of the instruments 25 and 26 is also grounded on the said stem, the spring 30 being insulated from the spring 29 and electrically connected with the wire 31 which leads to the battery B. The wires 32 and 33 con nected to the transmitter 25 and receiver 26 are respectively connected to the terminal posts 34 and 35 on the terminal block T.

The battery B is connected to the terminal posts 36 and 37 on the terminal block T and a common wire 38 is connected to a terminal post (not shown) within the casing of the receiver 14, the wire 39 leading to the impedance coil 16 also being connected to said terminal post. The wire 40 leads from the terminal post 34 to the loud talking receiver 14 and the wire 41 leads from the-terminal post 35 to'the transmitter 15.

A simplified diagram of the connections is shown in Fig. 3. In this diagram, it will be seen that the transmitter 15, impedance coil 16, and battery B p are connected in series with the receiver 26 of the passengers telephone set when the circuit closer C is depressed. The conductor 42 connects the receiver 26 and transmitter 15. The transmitter 25 of the passengers set and the loud talking receiver 14 of the operators set are connected by wires 43, 44 and 45 in shunt with the series circuit above described, and both the shunt and series circuit are controlled by the circuit closer C. The im-- pedance coil 16 therefore only affects the transmitter circuit of the operator when he communicates with the passenger.

From the foregoing description the operation of the device will be apparent. When the passenger desires to communicate orders Q1 converse with the chauffeur or'op erator of the vehicle, the hand set is removed from the hook 46 or other suitable place where itmay be kept, and by presing the button 28 transmits a click to the receiver 14 'to call the operators attention, the circuit being closed, and under the control of'thepassenger. Conversation may be carried on in both Idiredzions and when completed the spring 29 automatically opens the circuit:

It will be seen that a simple and satisjfactory telephone set is provided which permits" intercommunication between the passenger and operator compartments'providing an instrument at the operators position as shown and described.

aving thus described my invention,

what I claim is:

1. In a vehicle provided with a passenger compartment and an operators compartment, a means for inter-communication between said compartments comprising a per forated casing mounted in the operators compartment, a common mouth and ear piece for said casing, a transmitter and a loud speaking receiver within the casing, an impedance coil within said casing and in series with the transmitter therein, transmitting and receiving means in the pas senger compartment, current supply means, and suitable connections between said current supply means, transmitters and receivers. r

2. In a telephone system, the combination of a pair of stations, a transmitter and receiver located at each of said stations, an impedance coil connected in series with only one of said transmitters, current supply means and means for controlling the interconnection of said current supply means, transmitters and receivers.

3. In a telephone system for automobiles, the combination of a circuit comprising a transmitter, a receiver, an impedance and a mobile the combination of a transmitter, a

receiver, a second transmitter, a second receiver, an impedance connected to sand second transmitter and to said second receiver only, means electrically connectin said first mentioned transmitter and secon receiver, means electrically connecting said first mentioned receiver and second transmitter, current supply means electricall connected with both transmitters-and bot receivers, and. a normally open switch for a controlling the connection of the current-to said receivers and transmitters. 5. In a telephone apparatus of the class described, the combination of a metal casing having an opening in a side wall thereof and perforations in an end 'wall thereof, a mouth and ear piece mounted in the opening in said side walI, a receiver located in the casing directly opposite said opening and mouth and ear piece, a transmitter within the casing adjacent said perforated wall,- and an lmpedance c011 in said .caslng and 

